[Heathkit] RE: SB-200

[John Peters]

Getting off-topic.. but 10dB antenna gain is the best amplifier indeed.. 
works on RX too big advantage I can say...

73! de John PA5MS

running a SB-200 with chinese tubes.. on 240V AC getting arround 700Watt out 
on 40m

----- Original Message ----- 
From: "crawfish" <crawfish at surfmore.net>
To: "WA3GIN in Alex. City, VA" <wa3gin at erols.com>; 
<kgordon2006 at verizononline.net>; <Heathkit at mailman.qth.net>
Sent: Thursday, July 27, 2006 7:27 PM
Subject: Re: [Heathkit] RE: SB-200


>I made that statement on the AMPS reflector last winter and got a lot of
> negative comments. So recently I unsubscribed from them, and decided to 
> stay
> on lists with people who can speak from experience. I liked the comments
> from a HK once who said his 4-el. quad at 25 meters high was his"linear
> amplifier in the air".I had two stations in two different areas cut their
> power back from 1500 to 500, and there was no difference in 
> readability.This
> was on 6 meters, one was 1200 miles away, the other 2200 miles away.Good
> info all away around!!
>                                  Joe W4AAB----- Original Message -----
> From: "WA3GIN in Alex. City, VA" <wa3gin at erols.com>
> To: <kgordon2006 at verizononline.net>; <Heathkit at mailman.qth.net>
> Sent: Wednesday, July 26, 2006 5:59 PM
> Subject: RE: [Heathkit] RE: SB-200
>
>
> ...and also remember that double the power is 3db. So, the difference
> between 500 watts and 1,000 watts is hardly worth the energy to product 
> the
> extra 3 db.  With AGC, DSP, DNL, BC, one probably can't hear the 
> difference,
> let alone see it on a segmented "S" meter display or on an old analog 
> meter.
> I'd spare the tube, reduce the electrical bill, run 500 watts and use the
> saved money to purchase a beam antenna with 10 db gain.  That 10 db is
> noticeable and the power company can't charge you for it, HAHA.
>
> 73,
> dave
> wa3gin
>
>
> -----Original Message-----
> From: heathkit-bounces at mailman.qth.net
> [mailto:heathkit-bounces at mailman.qth.net] On Behalf Of Kenneth G. Gordon
> Sent: Wednesday, July 26, 2006 5:54 PM
> To: Heathkit at mailman.qth.net
> Subject: Re: [Heathkit] RE: SB-200
>
> On 26 Jul 2006 at 18:34, Cam and Juli Hedrick wrote:
>
>> I have an SB-230 that I reworked into a SB-200 style.  My output is
>> 620 watts keyed down.  Amprex 572B tubes in it and are great
>> tubes....20 years old, but only 2 years use.  Meter 2500VDC and .520
>> ma, hmmm, a nice amplifier saved.
>
> OK. Thanks for the data. If we assume that your meter readings are
> absolutely correct (foolish assumption, but good enough for this
> discussion), i.e. we ignore meter and visual errors, then you are
> running it at 1300 watts input.
>
> At 620 watts output, that is 47% efficiency, which is right in the 
> ball-park
>
> for these types of amps.
>
> As I said, 800 to 900 watts output with the rig as designed by Heathkit
> is pretty difficult for me to accept.
>
> They are a darned good little amp, but they aren't SuperMan either, and
> don't/can't violate the laws of physics.
>
> Ken W7EKB
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